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Financings and Capitalization (Schedule of Debt Maturities) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
2023 $ 1,091  
2024 1,582  
2025 281  
2026 332  
2027 793  
Debt issuance costs (less than) 120 $ 118
CMS Energy    
Debt Instrument [Line Items]    
2023 0  
2024 250  
2025 250  
2026 300  
2027 625  
NorthStar Clean Energy, Including Subsidiaries    
Debt Instrument [Line Items]    
2023 100  
2024 0  
2025 0  
2026 0  
2027 0  
Debt issuance costs (less than) 1  
Consumers Energy Company    
Debt Instrument [Line Items]    
2023 991  
2024 1,332  
2025 31  
2026 32  
2027 168  
Debt issuance costs (less than) $ 67 $ 62